View source for Bluetooth Headtracker


== NOTE: THIS HAS BEEN SUPERCEDED BY  https://github.com/roberttwomey/bluetooth-headtracker ==


https://farm9.staticflickr.com/8567/16281491925_66cc3868bf.jpg

A bluetooth, rechargeable, 10DOF head-tracking device  for use with the [http://www.ambisonictoolkit.net/ Ambisonic ToolKit (ATK)], motion capture, and [[Pan-Tilt]] camera systems. This is the second prototype.
=Hardware=
Built with simple, ready to order parts from common suppliers. Purchase 1 each of the following:
*Bluefruit EZ-Link - bluetooth modem w/ baud rate detection - http://www.adafruit.com/product/1588
*Arduino Pro Mini 3.3V - https://www.sparkfun.com/products/11114
*Power switch - https://www.sparkfun.com/products/102
*GY-86 - 10 DOF flight control module with MPU6050 + HMC5883L + MS5611 - http://www.amazon.com/Arrela-Control-Ms5611-Hmc5883l-Mpu6050/dp/B00KKJYMO6/
*LiPo Battery - https://www.sparkfun.com/products/731
*LiPo Charger - https://www.sparkfun.com/products/10217 (note you need to cut off the JST connector to fit it in the enclosure)
*Small quantity of stranded ribbon cable.

One of the following, needed to program the arduino. (One use only! Borrow from a friend?)
*FTDI Basic 3.3V - https://www.sparkfun.com/products/9873
*FTDI Cable 3.3V - http://www.adafruit.com/product/70

You can also choose to leave the LiPo charger out of the enclosure for small space savings.

=Software=
This project uses the [http://www.varesano.net/projects/hardware/FreeIMU FreeIMU] library to read the motion sensors and calculate sensor-fused orientation. 

==Arduino==
We are using the straight FreeIMU_quaternion example from FreeIMU v0.4. This reads the attached sensors, calculates the AHRS quaternion, and transmits via serial print.
I've attached a copy of the FreeIMU_quaternion code here with the baud rate set to 38400, the max rate for the Arduino Pro Mini. 

You should only need to upload this to your arduino once.

[[:File:FreeIMU_quaternion.zip]]

==Processing==
This is the demo app in Processing included with FreeIMU v0.4.
#With the headtraker powered on, pair your computer with the bluefruit device.
#Change the serial port screen to match your bluefruit device, for example ''/dev/tty.AdafruitEZ-Link3e2f-SPP'' on my system.
#Run the example. Press 'h' to store the home position.
[[:File:FreeIMU_cube.zip]]

==Python==
Simple python program to read from the IMU headtracker and record to file. Additionally opens second serial device and feeds values to pan-tilt camera in matching orientation. 

[[:File:head_through.zip]]

==Supercollider==
coming soon... :)

=Enclosure=
https://farm8.staticflickr.com/7538/16255567716_410f1b46dc_z_d.jpg

==3d Printing==
Solidworks Files - [[:File:btht_solidworks.zip]]

STL Files - [[:File:btht_enclosure_stl.zip]]
==Assembly Instructions==

=Reference=
==other intertial Measurement Units==

Head-tracking with the MPU6050
*using Wire interface - http://www.varesano.net/blog/fabio/initial-tests-freeimu-v04-and-mpu6050
*using i2cdevlib - https://github.com/jrowberg/i2cdevlib/tree/master/Arduino/MPU6050/Examples/MPU6050_DMP6
*http://www.geeetech.com/wiki/index.php/MPU-6050_Triple_Axis_Accelerometer_%26_Gyro_Breakout
*IMU - https://dev.qu.tu-berlin.de/projects/sf-razor-9dof-ahrs/wiki/Tutorial
*https://www.sparkfun.com/products/11028 or even cheaper from Amazon
Example with Arduino Nano
*http://www.geekmomprojects.com/mpu-6050-dmp-data-from-i2cdevlib/

GY-80
*https://github.com/vshymanskyy/GY80

GY-86
*http://amzn.com/B00KDMJBFK

==IMUs for position==
*https://developer.oculusvr.com/forums/viewtopic.php?f=33&t=1679
*https://www.youtube.com/watch?v=6ijArKE8vKU